PHP 5 in Practice Code Listings:

/ code

01-strings/
02-numbers/
03-dates/
04-variables/
05-arrays/
06-functions/
07-objects/
08-files/
09-web/
10-forms/
11-validation/
12-sessions/
13-webservices/
14-databases/
15-datastorage/
16-email/
17-xml/
18-images/
19-error/
20-auth-enc/
B-SPL/